Polishing device



Sept. 10,` 1935. A. J. STECKER POLISHING DEVICE Filed Feb. 23

Patented Sept. y 10,

' UNITI-:D IsTATEs-PMENT OFFICE-j 'y 2,014,119 s l reu-ary es, 19:4, sei-nino. 112.511 I luth-.(q-lS-Zn' l Y,

' l'rms invention relates to a power driven-hand operated polishing device' and more particularly to the construction .of the device including a ilexible driving connection between a drivingand a driven member thereof.

an object of the invention nto provide a .ae-A

the work, regardless of the angular position of the driver relative to said polisher. Y

A further object is to provide an'arrangement whereby the flexible driving connection between driver and polisher, will yield to provide a soft yielding pressure of the polisher upon the surface of the work; and further, to provide a construction of polisher wherein the iiat side and peripheral rim thereof are covered by a covering of soft fibrous material which may be conveniently removed and replaced and which forms an even,

rounded peripheral polishing edge for the pol isher.

A further object is to provide a small power driven polisher having a construction which particularly adapts it for use in polishing uneven or curved surfaces by manipulation of the device as a unit while held in one handby the operator, said unit embodying an electric motor and being light in weight, simple in construction, and having certain other new and useful features, all as hereinafter set forth, reference being had to the accompanying drawing wherein- Figure l is a side elevation of a device illus.-

trative of an embodiment of the present inven-l Fig. 2 is a transverse axial section through the polisher head, detached; Fig. 3 is a plan view of the polisher; and

Figni is a-seetional detail or the polisher head Y showing a slightly modified construction.

.'I'he device as a whole, is shown in Figure l and comprises a small electric motor. the casing ing I andformingabearingwithin whichaver tical shaft lis moxmted. any suitable gearing 1 beingl housed within said housing l for transmitting motion from the shaft vI to the upper end of said shaft 6. Secured to the top of said hous- I ing is a bracket I'for supporting a handle i in horizontal-position above and spaced from said casing I. A Y A polisher head or wheel, indicated as a whole by thenumeral il, is detachably securedto the l0 projecting lower end of said shaft 6 and is of circular form with a substantially flat lower side and curved periphery covered by a iibrous material to engage the work, said polishing head or member with said motor provided with a handle, 15

forming a unit which may be easily manipulated by'one hand of the operator to pass the ,polisher over the surface to be polished, with just the desired pressure, the weight of the motor` assisting in giving this pressure and in steadying the 20 polisher` to prevent vibration and to give it the proper even contact with the work.

In order that the polishing head or wheel 4may follow the contour of the surface being polished,

no matter in what angular positionl the drivingA 2;',

shaft 6,' which is driven by the motor, may be relative to said surface or head, a exible connes# tion is provided between said shaft and head,- said driving connection comprising preferably, a disk II of rubber or other suitabley material, this disk having a-center opening to receive the externally screwthreaded and reduced lower end of a collar I2 having an axial bore to receive the encl of the shaft 6 to which said collar is detachably secured by a set screw I I, and to secure the central portion of this disk to said collar, a nut I4 is screwed upon the reduced end of said collar with a ring I5 interposed between said nut and coiiar/ to firmly clamp thiscentral portion of thedislf to the collar.

The polishing head or wheel comprises a sheet metal ,disk I6 having an upturned peripheral edge I1 and secured over the lower flatl face of this disk and rolled upwardly and over said upturned edge flange, is a' layer of sheepskin Il 45 with natural wool i9 thereon, and interposed between this skin and disk is a layer 2li of any suitable material such as canvas or the like, with the ledges of both layers extended upward and over the edge ange of said disk and drawn 2 I Y aol-1,119

smooth round peripheral edge for the head, which edge is of considerable. thickness in cross section with the wool covering projecting therefrom, thus forming a peripheral bufiing or polishing edge for the head with the wool or other nbre covering said edge to prevent it from coming into contact with any projecting portion oi.' the work and .injuring the same. This edge so covered, thus provides a comparatively narrow bumng or polishing portion for the hea'd.

To attach the disk II to the periphery of the flexible rubber disk Il, a ring 22 of considerable width vertically is secured upon the upper face ot the disk I6 concentric therewith, and the edge portion of this rubber disk is secured thereto by means of a clamping ring 23 laid thereon and the -rings secured together with the edge portion of said disk I6 clamped therebetween, by screws 2| passing through said disks and rings.

The space between the disks Il and Ii and within the ring 22 may thus form a substantially air tight chamber 25 which will act as 'an air cushion beneath the rubber disk Il to prevent too iree' fiexure or collapsing thereof under pressure thereon applied through the shaft i in forc` ing the head against the surface being polished.

Preferably as shown. the flexible disk Il which connects the polishing head with the end of the drive shaft S, is cupped to offer further resistance to downward ilexure and prevent the nut Il from coming into contact with the disk It, the cupping of said rubber disk providing a greater area thereto, so that it will more easily flex an'd give a soit cushioning otthe head upon the work',

this rubber disk is of suiiicient thickness to provide an adequate driving connection between said shaft and head.

Obviously as shown in Fig. 4 the ring 22 may be omitted if desired, the peripheral portion o; the flexible disk Il being secured directly to the metal disk I6, and as -a. substitute for the lacing 2| an expansion ring- 26 may be provided to de- Y tachably hold the edges of the layers I 8 and v20,

v the flange. being curved inwardly to form a 1| channel to receive said edges with said ring expanded thereagainst, thus clamping said edges within said channel. l Obviously other changes in the construction,

arrangement or size and proportion of the parts '15 shaft and at its marginal portion -to said head to l form a closed air chamber between said disk and .head and adapted' to yield upon lateral tilting of said shaft relative to said head when said head is moved with its work contacting side in contact with an irregular surface of the work, the I coniined air in said chamber serving to support said disk under endwiseforce of said shaft applied thereto.

. ALFRED J. STECKER. 

